If for every 41 games that had Denuevo one didn’t had DRM Denuevo wouldn’t be a DRM software. However Denuevo is a DRM software, a game cannot both have Denuevo and not have DRM, however a game can be on Steam and not have DRM, therefore Steam is not DRM.

Btw, I think the ratio is way off, the vast majority of games on steam are Indy which don’t usually integrate with DRM.